21
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The Hindu/Arabic system of writing numbers is the sytem which is used in most countries of the world. The Hindu/Arabic numbers are... 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0.
6,000,000,000
On converting the Arabic number into roman numerals we get that : 120 in roman numerals is written as : CXX where C=100 and X=10.
Numbers with more than two factors.
8and12